Many people volunteered to donate blood; however, the blood bank needs ________.
| A．some | B．less | C．much | D．more |
The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.
| A．thus | B．otherwise |
| C．therefore | D．later |
Most students are for the new school rule, which says all the students not take their cell phones into the classroom.
| A．will | B．can | C．shall | D．must |
He was admitted to our school two years ago, a top school in our hometown, _____ he has been crazy about reading electronic novels, killing time.
| A．after that | B．since that |
| C．after when | D．since when |
The young couple, who returned my wallet, left _____ I could ask for their names.
| A．before | B．while | C．after | D．since |
It was really a great to all the teachers and parents that no students were injured in the accident.
| A．help | B．relaxation | C．relief | D．favor |